Tch! Nothing weird. I’ve just told you** you can be mistaken in use of English.
Had the preposition been ‘for’, not ‘to’, then lots of murders on trains might have been a reasonable suspicion. But it’s ‘to’, so for ‘train’ to be a noun, not a verb, would require a verb to exist between ‘to’ and ‘train’.
Or maybe you were suffering an optical illusion along the lines of…
… and thought the headline was ‘death scenes to train train investigators’?
(**Too juicy to resist. Sorry) 
Also, wasn’t a series of miniature death rooms like this an integral part of a series of CSI episodes?
